I like how all the pictures show the user typing with one hand and using the mouse (or some other activity) with the other. I'm thinking if I was one-handed, that might irritate me a bit.
And what if I only have a RIGHT hand?
It does kind of make me wonder. I understand you reach a wider market by appealing to two-handed people, and ostensibly, the more people buy it, the less the technology costs -- which is good, considering that most assistive technology costs you an arm and a leg, ha ha. But at the same time, if you honestly need a product like that physically, you might think it's not for you if you see a two-handed person using it, you know what I mean? I saw the half QWERTY before, and dismissed it because I'm right-handed, but at the same time I figured oh, it wouldn't be good for me anyway because maybe it won't have the full functionality, maybe I'm expected to use two hands for something somehow, since they keep saying have one hand on the mouse and type with the other.
I think at least they should show more pictures for both scenarios -- 2 hands alternating, then only one hand on the keyboard. The Frogpad, too, says its primary market is for people who want something for their PDAs or holding documents at the same time, etc.. When you see something like that, it doesn't necessarily mean that you can't adapt it for your own needs, but sometimes it does give the impression that it won't be enough. Assistive technology is so medicalized sometimes that it's hard to find in everyday places, and it can be disappointing to look up a one-handed keyboard and then figure it must only be for two-handed people.